Valeri Karpov

@code_barbarian

Building since '14 📖 New eBook: 💻

Miami Beach, FL
masteringjs.io
Joined May 2013
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  1. Pinned Tweet
    28 May 2020

    My new eBook, "Mastering Mongoose", is up!

    6 replies 18 retweets 42 likes
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  2. Retweeted
    15 Jun 2020

    Mastering Mongoose teaches 3 different design patterns for instantiating models. The first is called the "export model pattern." It's simple and easy to work with, but comes with limitations. Get the eBook and learn more: 

    1 reply 78 retweets 40 likes
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  3. Retweeted
    20 May 2019

    The maxTimeMS option in MongoDB is tragically underused. It can prevent one slow query from slowing down other, faster queries

    1 reply 53 retweets 29 likes
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  4. 2 hours ago

    Most realistic coding interview question: Here's a function written 10 years ago. Makes heavy use of a dead framework. No documentation. Original author left years ago. Find and fix the bug.

    1 reply 5 retweets 2 likes
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  5. Retweeted
    3 hours ago

    Pro tip: you can avoid a bad version of a package by using `<` in semver

    2 retweets
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  6. Retweeted
    8 Jul 2020

    5 Reasons why Vue is better than React: Bonus 6th reason: Facebook is not involved with Vue

    5 replies 173 retweets 68 likes
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  7. Retweeted
    31 Dec 2018

    In the past, my best New Year's resolutions were processes, not goals: ❌ Learn to code ✅ Code 1 hour/day ❌ Lose 10 pounds ✅ Do 10 minutes on the bike every day ❌ Write a book ✅ Write 3 hours every Friday Focus on habits, not outcomes.

    10 retweets 54 likes
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  8. Retweeted
    2 Jun 2020

    My new favorite bit of JavaScript syntactic sugar: `await` is a unary operator, so you can use `await` to call an async IIFE without the ugly parentheses. Learn more: 

    6 replies 195 retweets 94 likes
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  9. Jan 12

    2022 goal: read Twitter less, post more Not that I don't get value from reading Twitter, I just have a tendency to listen passively without making myself heard "Two ears and one mouth so we can listen twice as much as we speak" cuts both ways

    1 retweet 1 like
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  10. Retweeted
    Jan 12

    RegExp pro tip: `^` at the start of a set negates the set. For example, below is how you can test whether a string does NOT start with 'A'.

    1 retweet 1 like
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  11. Retweeted
    20 Nov 2019

    When should you use route parameters vs query parameters in Express? 

    4 replies 151 retweets 42 likes
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  12. Retweeted
    29 Jun 2019

    To master modern JavaScript, you need: - Fundamentals - Webpack - Node.js - Vue - Express - Mocha - Mongoose - Axios Conveniently, those are the categories for

    8 replies 81 retweets 92 likes
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  13. Retweeted
    Jan 11

    TypeScript expectation: "JavaScript that scales! Your code will never break again!" TypeScript reality: compiler is just one more point of failure

    2 replies 7 retweets 8 likes
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  14. Retweeted
    27 Jul 2019

    Async functions vs async arrow functions vs async generator functions - which ones return a promise? 

    64 retweets 35 likes
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  15. Jan 11

    Check out my weekly newsletter on for more JavaScript content!

    1 retweet 1 like
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  16. Retweeted
    9 Jun 2019

    My current dev laptop is an Asus VivoBook running Xubuntu. 15 inch screen, 32 GB RAM, weighs 3.7lb, costs $1300. Makes me wonder why devs still bother buying macbooks - you pay twice as much for the same specs and worse UI/UX.

    12 replies 5 retweets 35 likes
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  17. Jan 11

    TypeScript expectation: "JavaScript that scales! Your code will never break again!" TypeScript reality: compiler is just one more point of failure

    2 replies 7 retweets 8 likes
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  18. Retweeted
    Jan 11

    Sinon stubs have a `getCall()` method that returns information about a particular time the stub was called, including `args` and `returnValue`. Learn more 👉

    1 reply 4 retweets 2 likes
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  19. Retweeted
    5 Jun 2020

    `find()` with LIKE in Mongoose:

    64 retweets 19 likes
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  20. Retweeted
    23 Jul 2018

    My blog now has a handy list of all my articles on async/await, check it out:

    55 retweets 29 likes
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  21. Retweeted
    Jan 10

    Tech content is broken because we have way too many "thought pieces" 🤢 and "build an app with framework X build tool Y bloatware Z" tutorials 😴 Check out ' most popular tutorials. By far the most popular is how to concatenate strings

    1 reply 2 retweets
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